On Tue, Oct 7, 2008 at 8:10 AM, Alexander Borghgraef
<[EMAIL PROTECTED]> wrote:
> I'm trying to figure out how to do animated graphics in pylab using
> imshow, so I made this little 'hello world' equivalent showing a
> moving square over two frames.
> Problem is I have to call draw twice to refresh the image. Anyone can
> explain why this is so (and how to do this more elegantly)? This is
> the code:
I do not see this problem using svn HEAD (the first draw after setting
the frame2 data shows the frame2 image).
There are a couple examples showing how to do animation for images in
the mpl examples dir -- see attached
#!/usr/bin/env python
"""
An animated image
"""
import time
import gobject
import gtk
import matplotlib
matplotlib.use('GTKAgg')
from matplotlib import rcParams
from pylab import *
fig = figure(1)
a = subplot(111)
x = arange(120.0)*2*pi/120.0
x = resize(x, (100,120))
y = arange(100.0)*2*pi/100.0
y = resize(y, (120,100))
y = transpose(y)
z = sin(x) + cos(y)
im = a.imshow( z, cmap=cm.jet)#, interpolation='nearest')
manager = get_current_fig_manager()
cnt = 0
tstart = time.time()
def updatefig(*args):
global x, y, cnt, start
x += pi/15
y += pi/20
z = sin(x) + cos(y)
im.set_array(z)
manager.canvas.draw()
cnt += 1
if cnt==50:
print 'FPS', cnt/(time.time() - tstart)
return False
return True
cnt = 0
gobject.idle_add(updatefig)
show()
#!/usr/bin/env python
"""
Copyright (C) 2003-2005 Jeremy O'Donoghue and others
License: This work is licensed under the PSF. A copy should be included
with this source code, and is also available at
http://www.python.org/psf/license.html
"""
import sys, time, os, gc
import matplotlib
matplotlib.use('WXAgg')
from matplotlib import rcParams
import numpy as npy
import matplotlib.cm as cm
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg
from matplotlib.backends.backend_wx import NavigationToolbar2Wx
from matplotlib.figure import Figure
from wx import *
TIMER_ID = NewId()
class PlotFigure(Frame):
def __init__(self):
Frame.__init__(self, None, -1, "Test embedded wxFigure")
self.fig = Figure((5,4), 75)
self.canvas = FigureCanvasWxAgg(self, -1, self.fig)
self.toolbar = NavigationToolbar2Wx(self.canvas)
self.toolbar.Realize()
# On Windows, default frame size behaviour is incorrect
# you don't need this under Linux
tw, th = self.toolbar.GetSizeTuple()
fw, fh = self.canvas.GetSizeTuple()
self.toolbar.SetSize(Size(fw, th))
# Create a figure manager to manage things
# Now put all into a sizer
sizer = BoxSizer(VERTICAL)
# This way of adding to sizer allows resizing
sizer.Add(self.canvas, 1, LEFT|TOP|GROW)
# Best to allow the toolbar to resize!
sizer.Add(self.toolbar, 0, GROW)
self.SetSizer(sizer)
self.Fit()
EVT_TIMER(self, TIMER_ID, self.onTimer)
def init_plot_data(self):
# jdh you can add a subplot directly from the fig rather than
# the fig manager
a = self.fig.add_axes([0.075,0.1,0.75,0.85])
cax = self.fig.add_axes([0.85,0.1,0.075,0.85])
self.x = npy.empty((120,120))
self.x.flat = npy.arange(120.0)*2*npy.pi/120.0
self.y = npy.empty((120,120))
self.y.flat = npy.arange(120.0)*2*npy.pi/100.0
self.y = npy.transpose(self.y)
z = npy.sin(self.x) + npy.cos(self.y)
self.im = a.imshow( z, cmap=cm.jet)#, interpolation='nearest')
self.fig.colorbar(self.im,cax=cax,orientation='vertical')
def GetToolBar(self):
# You will need to override GetToolBar if you are using an
# unmanaged toolbar in your frame
return self.toolbar
def onTimer(self, evt):
self.x += npy.pi/15
self.y += npy.pi/20
z = npy.sin(self.x) + npy.cos(self.y)
self.im.set_array(z)
self.canvas.draw()
#self.canvas.gui_repaint() # jdh wxagg_draw calls this already
def onEraseBackground(self, evt):
# this is supposed to prevent redraw flicker on some X servers...
pass
if __name__ == '__main__':
app = PySimpleApp()
frame = PlotFigure()
frame.init_plot_data()
# Initialise the timer - wxPython requires this to be connected to
# the receiving event handler
t = Timer(frame, TIMER_ID)
t.Start(200)
frame.Show()
app.MainLoop()
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